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Add a low priority task to run in parallel


GearmanClient::addTaskLow

(PECL gearman >= 0.5.0)

GearmanClient::addTaskLowAdd a low priority task to run in parallel

Description

public GearmanTask GearmanClient::addTaskLow ( string $function_name , string $workload [, mixed &$context [, string $unique ]] )

Adds a low priority background task to be run in parallel with other tasks. Call this method for all the tasks to be run in parallel, then call GearmanClient::runTasks() to perform the work. Tasks with a low priority will be selected from the queue after those of normal or low priority.

Parameters

function_name

A registered function the worker is to execute

workload

Serialized data to be processed

context

Application context to associate with a task

unique

A unique ID used to identify a particular task

Return Values

A GearmanTask object or FALSE if the task could not be added.

Examples

Example #1 A low priority task along with two normal tasks

A low priority task is included among two other tasks. A single worker is available, so that tasks are run one at a time, with the low priority task run last.

<?php

# create the gearman client
$gmc= new GearmanClient();

# add the default job server
$gmc->addServer();

# set the callback for when the job is complete
$gmc->setCompleteCallback("reverse_complete");

# add tasks, one of which is low priority
$task$gmc->addTask("reverse""Hello World!"null"1");
$task$gmc->addTaskLow("reverse""!dlroW olleH"null"2");
$task$gmc->addTask("reverse""Hello World!"null"3");

if (! 
$gmc->runTasks())
{
    echo 
"ERROR " $gmc->error() . "\n";
    exit;
}
echo 
"DONE\n";

function 
reverse_complete($task)
{
    echo 
"COMPLETE: " $task->unique() . ", " $task->data() . "\n";
}

?>

The above example will output something similar to:

 COMPLETE: 3, !dlroW olleH COMPLETE: 1, !dlroW olleH COMPLETE: 2, Hello World! DONE 

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